Android Open Source - TriPeaksSolitaireForAndroid Base64 Coder

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * This file is a part of Tri Peaks Solitaire for Android
 */*from ww  w  . ja v  a2 s.  c  o  m*/
 * Copyright (C) 2013-2014 by Valera Trubachev, Christian d'Heureuse, Todor 
 * Balabanov, Ina Baltadzhieva, Maria Barova, Kamelia Ivanova, Victor Vangelov, Daniela Pancheva
 *
 * Tri Peaks Solitaire for Android is free software: you can redistribute it 
 * and/or modify it under the terms of the GNU General Public License as 
 * published by the Free Software Foundation, either version 3 of the License, 
 * or (at your option) any later version.
 *
 * Tri Peaks Solitaire for Android is distributed in the hope that it will be 
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 
 * Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with 
 * Tri Peaks Solitaire for Android.  If not, see <http://www.gnu.org/licenses/>.
 */

package eu.veldsoft.tri.peaks;

/**
 * Start Base64 encoding and decoding code.**NOTE*** This is NOT my code. This
 * code was written by Christian d'Heureuse to provide a more standard base64
 * coder that's fast and efficient. As such, I won't provide comments for that
 * code. Java does NOT provide a Base64 encoder/decoder as part of the API.
 * 
 * @author Christian d'Heureuse
 */
class Base64Coder {
  /**
   * 
   */
  private static char[] map1 = new char[64];

  /**
   * 
   */
  static {
    int i = 0;
    for (char c = 'A'; c <= 'Z'; c++)
      map1[i++] = c;
    for (char c = 'a'; c <= 'z'; c++)
      map1[i++] = c;
    for (char c = '0'; c <= '9'; c++)
      map1[i++] = c;
    map1[i++] = '+';
    map1[i++] = '/';
  }

  /**
   * 
   */
  private static byte[] map2 = new byte[128];

  /**
   * 
   */
  static {
    for (int i = 0; i < map2.length; i++)
      map2[i] = -1;
    for (int i = 0; i < 64; i++)
      map2[map1[i]] = (byte) i;
  }

  /**
   * 
   * @param s
   * 
   * @return
   * 
   * @author Christian d'Heureuse
   */
  public static String encodeString(String s) {
    return new String(encode(s.getBytes()));
  }

  /**
   * 
   * @param in
   * @return
   * 
   * @author Christian d'Heureuse
   */
  public static char[] encode(byte[] in) {
    return encode(in, in.length);
  }

  /**
   * 
   * @param in
   * @param iLen
   * 
   * @return
   * 
   * @author Christian d'Heureuse
   */
  public static char[] encode(byte[] in, int iLen) {
    int oDataLen = (iLen * 4 + 2) / 3;
    int oLen = ((iLen + 2) / 3) * 4;
    char[] out = new char[oLen];
    int ip = 0;
    int op = 0;
    while (ip < iLen) {
      int i0 = in[ip++] & 0xff;
      int i1 = ip < iLen ? in[ip++] & 0xff : 0;
      int i2 = ip < iLen ? in[ip++] & 0xff : 0;
      int o0 = i0 >>> 2;
      int o1 = ((i0 & 3) << 4) | (i1 >>> 4);
      int o2 = ((i1 & 0xf) << 2) | (i2 >>> 6);
      int o3 = i2 & 0x3F;
      out[op++] = map1[o0];
      out[op++] = map1[o1];
      out[op] = op < oDataLen ? map1[o2] : '=';
      op++;
      out[op] = op < oDataLen ? map1[o3] : '=';
      op++;
    }
    return out;
  }

  /**
   * 
   * @param s
   * 
   * @return
   * 
   * @author Christian d'Heureuse
   */
  public static String decodeString(String s) {
    return new String(decode(s));
  }

  /**
   * 
   * @param s
   * 
   * @return
   * 
   * @author Christian d'Heureuse
   */
  public static byte[] decode(String s) {
    return decode(s.toCharArray());
  }

  /**
   * 
   * @param in
   * 
   * @return
   * 
   * @author Christian d'Heureuse
   */
  public static byte[] decode(char[] in) {
    int iLen = in.length;
    if (iLen % 4 != 0)
      throw new IllegalArgumentException(
          "Length of Base64 encoded input string is not a multiple of 4.");
    while (iLen > 0 && in[iLen - 1] == '=')
      iLen--;
    int oLen = (iLen * 3) / 4;
    byte[] out = new byte[oLen];
    int ip = 0;
    int op = 0;
    while (ip < iLen) {
      int i0 = in[ip++];
      int i1 = in[ip++];
      int i2 = ip < iLen ? in[ip++] : 'A';
      int i3 = ip < iLen ? in[ip++] : 'A';
      if (i0 > 127 || i1 > 127 || i2 > 127 || i3 > 127)
        throw new IllegalArgumentException(
            "Illegal character in Base64 encoded data.");
      int b0 = map2[i0];
      int b1 = map2[i1];
      int b2 = map2[i2];
      int b3 = map2[i3];
      if (b0 < 0 || b1 < 0 || b2 < 0 || b3 < 0)
        throw new IllegalArgumentException(
            "Illegal character in Base64 encoded data.");
      int o0 = (b0 << 2) | (b1 >>> 4);
      int o1 = ((b1 & 0xf) << 4) | (b2 >>> 2);
      int o2 = ((b2 & 3) << 6) | b3;
      out[op++] = (byte) o0;
      if (op < oLen)
        out[op++] = (byte) o1;
      if (op < oLen)
        out[op++] = (byte) o2;
    }
    return out;
  }

  /**
   * Object less class.
   * 
   * @author Christian d'Heureuse
   */
  private Base64Coder() {
  }
}

Java Source Code List

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